글리시돌을 원료로 한 비이온 계면활성제 합성에 관한 연구 = A Study on Synthesis of Glycidol Based Nonionic Surfactant

다국어 초록 (Multilingual Abstract)

The PGLE and PGLE3 nonionic surfactants were synthesized from the reaction between glycidol and lau-ryl acid and their structures were confirmed by 1H and 13C NMR analysis. The CMCs of PGLE and PGLE3 surfactants were found to be 3.59×10-2 mol/L and 8.80×10-2 mol/L respectively and the surface tensions at their CMC conditions were 26.09 mN/m and 28.68 mN/m respectively, Dynamic surface tension measurement has shown that the adsorption rate of surfactant molecules at the interface between air and surfactant solution was found to be relatively fast in both surfactant systems, presumably due to high mobility of surfactant molecules. The contact angles of PGLE and PGLE3 nonionic surfactants were 25.5o and 9.5o respectively, Dynamic interfacial tension measurement showed that both surfactant systems reached equilibrium in 20 minutes and the interfacial tensions at equilibrium condition in both systems were 0.42 mN/m and 0.53 mN/m respectively, The PGLE surfactant system has indicated higher foam stability than the PGLE3 surfactant system, which is consistent with surface tension measurement. The phase behavior experiments performed at 25~60˚C in systems containing nonionic surfactant, water, n-hydrocarbon oil and cosurfactant showed a lower phase or oil in water microemulsion in equilibrium with excess oil phase at all conditions investigated during this study.